For a separately derived system, what grounding requirement must be met?

For a separately derived system, the grounding requirement that must be met is the installation of a separate grounding electrode system. This is crucial because a separately derived system creates a distinct electrical system that is isolated from the main service. In essence, this means it is necessary to establish a new grounding point to ensure that the system is grounded adequately and to provide safety against electrical faults.

Having a separate grounding electrode system helps in providing a path for fault currents and protects against voltage surges. This grounding is essential for the safety of both the system and any equipment connected to it, reducing the risk of electric shock and ensuring proper operation of protective devices.

Individual grounding requirements may vary based on local codes, but the fundamental principle remains that any separately derived system, such as a transformer feeding a load, must have its own grounding electrode. This approach helps achieve reliable bonding and grounding practices as outlined in Article 250, ensuring overall safety and efficacy in electrical systems.